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Increasing levels of carbon dioxide and other heat-trapping greenhouse gases in the atmosphere—what we used to call global warming but now call climate change—are likely contributing to the extreme weather of recent years. And this affects our health.

By looking back at 2013, can we learn anything about what to expect going forward in the realm of infectious diseases? In spite of newly emerging diseases like MERS and influenza H7N9, we continue to make progress with our vaccines and therapies.

A recent report on children working on tobacco farms in North Carolina, Kentucky, Tennessee and Virginia, details the health problems these youngsters experience: nausea, headache, vomiting, dizziness and difficult breathing.